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FTP PORT Problem

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by gregross

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I currently have my firewall setup to allow everything out due to the fact that an FTP program that my payroll users need is unable to connect to the banks FTP site. I have the FTP port that the bank requires along with a range of data ports but we are still unable to use it until I open up the firewall. When they try to connect through the FTP software it says connection refused by server.
Are there some other ports I need to open up besides the FTP port they assign and the data ports?

Thanks

5 replies

by joseph moore

Well, TCP port 21 is the FTP data transfer port, but there is also TCP port 20, the FTP control port. You need connectivity through both ports for FTP access to work.

by mark

Standard FTP uses Ports 20 and 21. If you are hitting a bank, they probably use SSL FTP which uses port 990. They could also use any port they want to increase security, so you really need to talk to the IT Dude at the Bank for their setup.

Also, make sure your FTP Client is using Non-Passive mode and use explicit FTP SSL if making an SSL connection.

You can also find some port assignments at: http://www.iss.net/security_center/advice/Exploits/Ports/default.htm Use Ctrl-F and search for FTP and you will see some ports used by FTP clients.

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